To install the indicators/EA on MAC, please follow the instructions below:
From your Applications folder, go to Fusion Markets, then " Show Package Contents."
Select Drive C Folder
Under the folder "Fusion Markets MetaTrader 4", choose "MQL4" then "Indicators" and copy and paste the indicator to this folder. If it's EA, the folder should be "Experts" then copy and paste the EA into the Experts folder.
Once done. Close the MT4 platform and re-open it again.